138640124 has 24 divisors (see below), whose sum is σ = 278892768. Its totient is φ = 59071680.

The previous prime is 138640109. The next prime is 138640133. The reversal of 138640124 is 421046831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9467 + ... + 19154.

It is an arithmetic number, because the mean of its divisors is an integer number (11620532).

Almost surely, 2^138640124 is an apocalyptic number.

138640124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138640124 is an abundant number, since it is smaller than the sum of its proper divisors (140252644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138640124 is a wasteful number, since it uses less digits than its factorization.

138640124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28805 (or 28803 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 138640124 is about 11774.5540892214. The cubic root of 138640124 is about 517.5627114057.

Adding to 138640124 its reverse (421046831), we get a palindrome (559686955).

The spelling of 138640124 in words is "one hundred thirty-eight million, six hundred forty thousand, one hundred twenty-four".